Modern civilization should really thank the American inventor Thomas Edison, who made the first white lamp with commercial value and brought light to mankind. However, Conrad Hubert deserves the same respect. He immigrated to the United States from Russia 100 years ago and invented the flashlight. Hubert came home from work, and a friend proudly showed him a flashing flowerpot. It turned out that he installed a battery and a small light bulb in the flowerpot. As soon as the switch was turned on, the light bulb lit up the flowers and looked dazzling. Hubert was fascinated by it, which inspired him. He sometimes walks in the dark at night, and it is inconvenient to be one foot high and one foot low. Not long ago, he had to carry a heavy oil lamp to the dark basement to find something. He thought, wouldn't it be practical and convenient if you could use electric lights to illuminate with you? So, Hubert put the battery and light bulb in a tube, and the first mobile lighting flashlight came ou